Because he faced an open revolt of the slaveholding states against the Union, Lincoln had arguably the single most difficult presidency of any Commander-in-Chief. He saw the country through the bloodiest war in U.S. history. He was a brilliant orator, and is forever remembered as the signer of the Emancipation Proclamation, which ended the scourge of slavery in America.

More than any other president, Lincoln left behind a nation transformed.

#AbrahamLincolnFTW

Born in a backwoods cabin in rural Kentucky, Lincoln's childhood was impoverished and bleak. His mother died when he was nine. Both his parents were almost completely illiterate, and Lincoln himself received little formal education. He rose from humble beginnings to become one of America's greatest leaders.

Lincoln was born into poverty and eventually became the greatest President of the United States. https://t.co/oRj2RKpyZA

Roosevelt took office in the midst of the greatest economic depression the country had ever seen. Unemployment ranged 20 to 27 percent, and nearly half the nation's banks had failed. FDR not only navigated the crisis, he created Social Security and the New Deal. Though he came from wealth, he fought for the poor and downtrodden. And during World War II, he showed himself to be a brilliant Commander-in-Chief. He appealed to Americans' higher selves.

When you help defeat the Nazis? You're definitely on the short list for Greatest President Ever.

#FDRForTheWin

And he did it all without the use of his legs.

FDR had already contracted polio, and was confined to a wheelchair before he became the greatest American President of the 20th century #Lawpic.twitter.com/wzZJb7T3R2